hesitation and low charging

alright, havent been on here in a long time but havin some troubles lately. at lower rpms my stang doesnt have the power it used too...almost seems like its leaning out or getting too rich type of thing but i cant smell a diff so i dont think its rich. f/p is at 40 with vac off. also lately ive been having a problem with my battery not lookin like its being recharged. i have the red top (cant think of the brand but you know what one) and an alternator thats not older than 2 years. charging volts vary from 12.6-13.2 while driving and rpms dont affect it. my oil pressure voltage or whatever seems to be higher than normal also. tryin not to drive it much just starting up here and there to see if the battery is dead plus the weather kinda sucks too but any ideas?

well the car does it at cold and hot idle. during the winters i run my idle at about 950 or so because my car has never liked cold weather and has always run pretty bad (nothing like it is now) when its cold cold out til it warms up. new spark plugs, wires, cap/rotor this past summer. i use my radar detector to see the volts going through my system when driving but i will test the battery itself tomorrow. i will probably go ahead and change the fuel filter and clean the maf and air filter also. might as well get the simple stuff outta the way first.

i will take it to autozone tomorrow to see if they can do a check on it. it does this with every accessory off and my amp/sub fuse taken out and the same with all of it blaring at full blast. something is up and im wondering if that is taking away from my spark and that why the hesitation is coming along with the charging problem.

this car has been my daily driver for about 6 years now and longest it sits is about 3 days. i was thinking bad gas with the chugging (i run 91 octane cause it starts to ping a bit on 89 and lower) but i filled it up again and ntohing different and that wouldnt have solved the voltage issue either. the red top battery has served me very very well and can last a dead alt for a long time (sadly had to test it on an old red top battery for an hour ride with a dead alt). hopefully someone can give me an idea that im not thinking of or hopefully the things i do tomorrow will give me an idea also. ty much

sounds good...ill do a full check on corrosion with anything that is touching the alt. i know about 3-4 years back the white/pearl plug that goes into the back of the alt fried on me and i had to replace. im hoping the engine issue has to do with lack of juice but we will see once i figure that out. my pops is an electrician so we can see if anything withing the system seems to be shorted or losing power within the line.

i did try to pull codes and there were no codes shown. it was just kinda outta the blue one day and been constant ever since. havent worked on my car in a long long time but its time to get my hands dirty again . ill report back tomorrow and keep giving ideas if you think of anything. thanx a ton for the help so far